.mainbox{width:1100px; background:#fff; box-shadow:5px 6px 6px #ddd,-5px 0px 4px #ddd; padding:10px 10px; margin:0 auto; margin-bottom:40px;}
#main_left{width: 310px;float: left;margin: 5px;}
#mainright{width: 740px;float: right;margin: 5px 0 0 5px;}
#tonglan1,#tonglan3{width:85%;overflow:hidden;margin:0 auto;}